Home / 128,788.96-177,732.48-72,201.28

Finding the Fourth Proportional to 128,788.96, 177,732.48 and 72,201.28

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Solution

The fourth proportional to 128,788.96, 177,732.48 and 72,201.28 is: 99,639.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,788.96 : 177,732.48 = 72,201.28 : x
  2. Step 2: Convert to fraction form
    128,788.96/177,732.48 = 72,201.28/x
  3. Step 3: Cross multiply
    128,788.96x = 177,732.48 × 72,201.28
  4. Step 4: Simplify right side
    128,788.96x = 12,832,512,553.57
  5. Step 5: Solve for x
    x = 12,832,512,553.57/128,788.96
  6. Step 6: Final answer
    x = 99,639.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.